When Chen Yan returned from three years of undercover service, what he brought back was not a medal, but a blood-stained list of moles. When he started the detonation process, he discovered that everyone at the top of the police station was having an affair - political commissar Lin Zhao's files, forensic doctor Zhou Huai's autopsy, informant Su Rui's encrypted records, and his mentor Lu Cheng's old accounts, all pointed to a long-forgotten 'clean-up operation'. The real mastermind behind this incident was actually his master, the old ghost, whom he thought was dead. This time, he no longer believed in the organization, but only believed in the mine he had laid with his own hands.
